Power hammer



Jul #6, 1929-. A; N. BQWMAN 1221, 429

' POWER HAMMER I Filed Sep t. 29, 1927' 5 Sheets$heet 1 #1 1V: flaw/mil,

July 16, 1929; BOWMAN 1,721,429

POWER HAMMER 'Filed Sept. 29, 1927 5 Sheets-$heet 2 3 y 16, 1929- A. N. BOWMAN v 1.72729 POWER HAMMER Filed Sept. 29, 192'? a sneet-sheet 3 gwumtoz 30 K 1 above the oblique brace,-

Patented July 16, 1929.

1 UNITED STATES ALFREDIN.BOWMAMOF'OXFORR'OHIQ.

rowan HAMMER.

Application filed September 23, 1927. ,fserial No. zzassa v This invention relates to a power'hammer.

It is primarilyvaimed to provide an apparatus of this kind having an improved frame consisting of novel coacting partsof steel so associated: as'to greatly lessen the Weight of machines or frames ofthis general character and reduce the cost thereof pract-icallyto one-half of the present cost. Another object is to provide a construction whereinstandard shape structural steel may be utilized. 7 7 Avfurther object is to providean exceedingly compact construction of frame where- .in thecolumn will be located at one side of the base. 1 Various additional objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawings illustratingan operative embodiment.

In said drawings Figure l is a side elevation, g

Figure2 is a side-elevation taken from theside opposite to Figure 1;. r

F igures 3 and 4 are opposite end elevationsy' fl Figure 5 is a top plan view; l i

Figure 6 is ahorizontal sectional view taken on the line 676 of Figure'lislightly Figure 7 is a alone. v a 1 I i Referring specifically; to thedrawings, 10 designates a base which is achannel member having its flanges rl-lwdisposed .downwardlyr Bolted against the flanges 11 are angle bars 13. A jcolumn 14' of "channel beam form rests on the horizontal flange of one of'the bars 13 and isbolted at.15 against the vertical flange of s'uch bar. The upper end portion of the column is inclined inwardly and upwardly at 16 to a point substantially centrally over the base 10. The said column 14 is braced and rigidified by a supplemental column 17, which has a vertical portion 18 bolted to the column 14 at 19 and an oblique portion 20 whose lower end is bolted at 21 against the vertical flange of the angle bar 13 opposite to that to which the column 14 is fastened. To accommodate the attachment of the supplemental column 17, the last mentioned vertical flange is depressed or inwardly offset as at 22.

Supported on the base 10 is a fabricated perspective view of theibase pedestal I or, 7 23 an anvil: e;

The specific structure of thepedes'talneeds no; specific description; Such pedestal 'is overlappedat the sides thereof byiheverti- ,ca-l flangesaof angle bars 13 which are se cured thereto as by bolts'25. In addition,

anchoring angle bars; or plates '26- are fasiten ed-as by; boltsf27. to the pedestalan'd as vby'bolts'28. to the-base.

iAs usualfthe hammer slidable- Such hammer, is designated 27; and

has a; dove-tailed portion -28xslidablywdis} posed in a verticallyarranged guide bracket 29.7., Such guide bracket 29 isidisposed at a right angle to the general plane .of the column 14 and it is fastened theretoby an oblique brace 30, havingbolts 31 securing it .tothe bracket and bolts 32 securing it to the column'17and vertical portion18.. Alsotan angle member or plate 33-hasone flange 34 tongue 37 whichis bolted lasat.3 8:;against one of the side flanges of the inclined por- ,The upp r end{ iterate constitutes part of abearing which; is com- Suitably .journaled in this bearing is a drive shaft 42having a pulley 43 thereon adapted tobe driven: from anyivsuitable source; of

47: is piyotejd at 48, "Adj ustably, fastened to the outer block are a pair of vertical'rods 49 carried;bya clamp 50 of conventio nal form,

which connects them to a semi elliptic spring 51 composed of laminated leaves 52. The

.b'olted at35 to, the column 1'4 andthe other o flangebolted as at 36 to thebracket 29; a The latter flange ;is. vertically extended into a tionelti of column 14.- The bracket -29gisiofia w fabricated monstructi'on needing no specific pleted bya plate-'40 boltedfin place as at .41.

outer leaf of suchspring 51 carries studs 53 which may turn in arcuate loops 44 thereof. Pins or studs 55 are adjustably connected to the pins or studs 53 by means of screws 56 and trained over the studs 55 is an endless'stra'p 57 of leather or otherflexible material and preferably of laminated construction. Such strap passes through an opening in the hammer 27 in order to suspend the latter and the strap is prevented from lateral displacement by means of washers or plates 58 carried on the studs 55. The tension of the strap and spring 51 is to direct .naled in the base and adjacent parts.

regulated through the adjustment of the screws'56.

The raising and falling of the hammer is controlled through the rotation of the eccentric drive therefor as described. A tightener for the belt 44 is shown in the, form of a bell crank lever 60 pivoted at 61 to one of the side flanges of thevertical por tion 18 of supplemental column 16. Such lever may have a roller '62 journal'ed thereon y engage the belt 44. Pivoted to the bell crank lever 60 isalink 64 which is pivoted to a treadle lever 66, whose fulcrum is .a rod'67' extending through and jolufie bell crank lever or belt tightener is normally held out of engagement with the belt since i the tightener is retracted through the agency of'a rod 68 pivoted-to the treadle lever 66, guided for vertical movement through a bracket 69 fastened to thecolumn 14 and having an 'expansivegcoi-l spring surroundi'n g the same and engaging the bracket at {68 at the other'end.

one end and an enlargement'70 on the rod Piv'oted at 71 to the plate is a brake lever 72 which has abrake 'shoe 73 pivoted thereto at 74 and'adapted for coaction with an inner annular wall of the drive pulley. Such lever 72 by means of a link 75 is effectively connected to the bell crank lever 60. The operator by depressing the treadle lever 66' controls theengagement and disengagement ojfthe b'elt'tightener or bell crank lever '60 with the drive-belt so as to thereby control the driving of the main shaft and raising and lowering of the hammer according to the work. It will be realized that whenthe lever 'is depressed, the'belt tightener engages the belt so that the latter 'willbe tightened in order to drive the pulley of thedrive' shaft 43. When such treadle lever 66 is released however the belt tightener will be retracted and-the belt will be loose'on'the pulley, thus out of driving relation with it and the brake lever '72 will be instantly applied to stop-motion of the ham mer since such braking means'is controlled from the belt tightener.

" Itis to be understood that'the parts conbase, one of the columns having an upper portion deflected inwardly over the base, a bracket secured to the column at one side thereof, a'hammer mounted bysaid bracket,

means on the deflected portion aforesaid to operate said hammer, an anvil pedestal on said base to coact with the hammer, an angle plate secured to the bracket andto one of secured to said deflected portion, and an oblique brace fastened to the bracket and to one of said columns. I

2. An apparatus of the class described comprising a base of channel form having flanges extending downwardly, angle bars at the sides of said base with their vertical flanges extending above the base, a column of channel form secured to one of said vertical flanges, a supplemental column of channel form secured to the other'vertical flange and to the first mentioned column above said base, the first mentionedcolumn having an upper inwardly deflected portion, a pedestal on said base overlapped by saidvertical flanges, a hammer to coact with the pedestal, a guide bracket for'the hammer disposed at one side of the first mentioned column, an

angle member secured to theflrst mentioned column and to said bracket, said angle member having a finger secured to thedeflected portion, and operating means for the hammer journaled at the top of said deflected portion. In testimony whereof I aflix my: signature.

. BOWMAN.

the columns, said angle plate having a finger 

